Perhaps you should try some spelling variations:
irrigation systemss » irrigation systems, irrigation system, irrigation schemes
irrigation scheme » irrigation systems
canal irrigation » scale irrigation
case irrigation » scale irrigation, use irrigation, change irrigation
supply canal » supply canada, supply annual, supply china
supply case » supply cost, supply chain, supply curve

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply canal irrigation systemss. ) or ( supply case irrigation scheme. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply canal irrigation systemss. ) OR ( supply case irrigation scheme. )).
• Adding a wildcard symbol may retrieve word variants: (( supply canal irrigation systemss. ) or ( supply case irrigation scheme. ))*.